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1. In a regression model involving 50 observations, the following estimated regression model was obtained: yˆ=10.5+3.2x1+5.8x2+6.5x3 For this model, SSR=450 and SSE=175. The value of the MSR is: A. 150 B. 3.804 C. 12.50 D. 275 2. In multiple regression analysis involving 10 independent variables and 100 observations, the critical value t for testing individual coefficients in the model will have: A. 100 degrees of freedom B. 10 degrees of freedom C. 9 degrees of freedom D. 89 degrees of freedom 3. A multiple regression analysis involving 3 independent variables and 25 data points results in a value of 0.769 for the unadjusted multiple coefficient of determination. The adjusted multiple coefficient of determination is: A. 0.385 B. 0.877 C. 0.591 D. 0.736 4. Which of the following is not true when we add an independent variable to a multiple regression model? A. The unadjusted coefficient of determination always increases B. The unadjusted coefficient of determination may increase or decrease C. The adjusted coefficient of determination can assume a negative value D. The adjusted coefficient of determination may increase 5. In a multiple regression model, the standard deviation of the error variable ? is assumed to be: A. constant for all values of the independent variables B. not enough information is given to answer this question C. 1.0 D. constant for all values of the dependent variables 6. In multiple regression, the mean of the probability distribution of the error variable ? is assumed to be: A. 0.0 B. 1.0 C. k,where k is the number of independent variables included in the model D. Any value greater than 1 7. In multiple regression analysis, even when there is no linear relationship between any of the independent variables and the dependent variable, then A. the chance of erroneously concluding that the model is useful is substantially less with the F-test than with multiple t-tests B. multiple t-tests of the individual coefficients may still show that some are significant C. we may conclude erroneously that the model has some validity D. all of the above statements are correct 8. A multiple regression model has the form yˆ=8+3x1+5x2-4x3 As x3 increases by 1 unit, with x1 and x2 held constant, then y, on average, is expected to: A. increase by 1 unit B. decrease by 16 units C. increase by 12 units D. decrease by 4 units
If the observed value is 4, the expected value is 5, and the standard error is 4, then the test value used for the z test is equal to
Test the hypothesis, at the 0.05 level of significance, that the size of a family is independent of the level of education attained by the father.
The population of lengths of aluminium-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.2 inches.
The following data lists the number of hours spent working during the previous week. From these data round the relative frequencies to three decimal places.
Before 1918, in a random sample of 11 wolves spotted in the region, what is the probability that 8 or more were male?
Randomly selected cans of Coke are measured for the amount of cola in ounces. The sample values listed below have a mean of 12.19 ounces and a standard deviation of 0.11 ounces. Use a 0.05 significance level to test the claim that cans of coke hav..
Why does Bob continue to play the video game even after losing $300?
Standard deviation of 10 minutes. A random sample of 16 cars is selected. What is the probability that the sample mean is between 45 and 52 minutes.
Determine the oucomes in the sample space, and construct a probability distribution table. Find the expected value of the following game.
A certain brand of apple juice is supposed to have 64 ounces of juice. Because the penalty for under-filling bottles is so severe, the target mean amount of juice is 64.05 ounces. However, the filling machine is not precise, and the exact amount of j..
Industry standards suggest that 13 percent of new vehicles require warranty service within the first year. Compute the mean and standard deviation of this probability distribution.
Determine a 95% confidence interval for the true mean weight of such boxes?
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